If the lady is not advertising I wouldn't bother to ring her, or text. Maybe a Pm will be enough.
If she is not advertising, chances are are she is NOT available.
Having said that, in the last week I exchanged private numbers with an escort and we send each other audios and texts and there was no problems. She wasn't working at all, for the whole month.
I also rang her one night before she left home and we talked about for 30 minutes. I suppose there has to be a certain trust and comfort between the two.
Know your boundaries and respect them. Always ask in advance before ringing. txt or Pms.
"THE CLEANER THE CLIENT, THE DIRTIER THE SERVICE..."
" I always leave them better than I found them"...